Video Inspection

Published: May 24, 2017 | Last updated: July 5, 2023

What Does Video Inspection Mean?

Video inspection in the context of trenchless technology is the process of inspecting underground water and sewer pipelines for damages, leaks and obstructions. Closed Circuit Television (CCTV) is mounted on crawlers that are guided through the pipelines by an operator above ground. Some cameras even allow pan and tilt options for detailed inspection of damages and pipe connections.


Trenchlesspedia Explains Video Inspection

During a video inspection, the mounted device is connected by cables to a monitor in the control room and is guided through the pipeline. The distance counter is set to zero and the distance is calculated from the launch point. It is advisable to clean the pipeline prior to launching if inspection is being done to assess damage on the inside wall of the pipe. The speed of the instrument should be ideally set at 6 meters per minute for pipes 200 mm. or less in diameter and 12 meter per minute for larger pipes. Lighting should be good enough to illuminate 2 meters ahead of the camera. Modern innovations in video inspection of pipes allow for tilt and pan for closer inspection, fish eye lenses that enable 180° view at any point, laser systems to measure the pipes profile and sonars for flooded pipe sections or inverts.


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